Remember to keep it simple and think how you will use it and how often..From the answer to how it will be used will determine what type and size needed..Everyone above gave you many examples of power requirements and what you need..1st power, then size/weight and its fuel...Now a Full timer in a RV park for power outage use will need to use the Gen what 2 to 4 times a year...Then I would get a simple portable Inverter type Gen with enough power for your main ac unit and run your electronics and lights...And since it stays at the rv park with you get a cover or better a storage box to keep it in stored under the 5er until its needed, that could be the slide out, front bedrm or rear lgrm..and slide it out, uncover, add fuel but which type is up to you for storage of that becomes the next problem..Now most portablem gens run on gas so watch the amount you keep and how long for even with Stable the shelf life is 3 to 4 months before it breaks down..unless your truck or car runs on gas. if so then you can rotate the stored fuel putting that fuel every 3 months into its tank and buy fresh fuel to keep..not much work to keep fresh fuel for the gen.....Good Luck on your choice of gen....If it was me get a Honda, Yamaha, a cheaper gen to used is the Champion 3200w for 799$..Remember drain(run out of fuel) the carb of fuel or it gums up and in the moment of need..no start or start and stalls out...